Method of mending or repairing sacks and the like and apparatus therefor.



F. WEVER & K. MAIER. METHOD OF IVIENDING 0R REPAIRING SACKS AND THE LIKE AND APPARATUS THEREFOR- Z APPLICATION FILED FEB. 15. 1910.

LMmWHI Patented July 6, 1915.

2 SHEETS-SHEET I.

will/1111111114 rllllnrlillllln Ling ===u=== INYENTORS, FR ITZWEVER and.

I'gfiRL MEIER,

HTYOR N EY.

COLUMBIA PLANOORAPH cm. WASHINGTON, D. c.

F. WEVER & K. MAIER. v E

METHOD OF MENDING 0R REPAIRING SACKS AND THE LIKE AND APPARATUS THEREFOR.

APPLICATION FILED FEB. 15. 1910.

L15890 Patented July 6, 1915.

2 SHEETS-SHEET 2- NvENT Rs. FRVI'Z. EVER and,

KARL Mm ER.

WMMM

Attomaj ran eras arrr rrrpn.

FRITZ VVEVER AND KARL MAIER, 0F STUTTGABI'I, GERMANY, ASSIGNORS TO THE FIRM 01E UNION SPECIAL-MASCHINENFABRIK IVE. LB. 1-1., 015 STUTIGABT, GERMANY.

METHOD OF MENDING 0R REPAIRING SACKS AND THE LIKE AND APPARATUS THEREFOR.

Specification of Letters Patent.

Patented July 6, I9I5.

Application filed. February 15, 1910. Serial No. 544,104.

To all whom it may concern:

Be it known that we, FRITZ -WEVER and KARL MAIER, citizens of the German Empire, residing at Stuttgaruin the Kingdom of Vvurttemberg, Empire of Germany,have invented certain new and useful Improvements in Methods of Mending or Repairing Sacks and the like and Apparatus Therefor; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In the machines hitherto employed for mending or darning sacks and the like, the workpiece had either to be brought by hand into the desired position, or in case a cloth feeder was provided, this could only move the workpiece forward in a uniform direction, so that it had to be turned again by hand, if the seam was to run in a fresh direction. The seam also, as a rule, was formed of a simple quilting stitch in zigzag lines over the surface of the workpiece to be mended. Now this method of mending is found quite insuflicient in practice, inasmuch as the tears or holes are frequently insufficiently covered, as it is not possible to place seams without great inconvenience at a uniform distance apart. The quilting stitch seam also only yields a very thin covering inasmuch as only a single thread is carried from one stitch hole to the other, so that the thread cuts into the material, without, sufficiently covering the edge of a tear.

Now these disadvantages are entirely removed by the improved method and apparatus for carrying out same which forms the object of the present invention.

The essential feature of the invention consists in a chain stitch seam, which completely covers the part, being made quite automatically in all its windings, so that merely a certain stretching of the material by hand is necessary.

To completely stitch over a tear or the like, it is preferable to carry the parallel seams transversely over its edges and as far as possible at uniform distances, these separate lines of seams having then to be connected in the shortest way by transverse rows of stitches, so that a complete covering seam is formed.

Now the improved method consists in melting such a seam over the surface to be mended, the entire seam consisting of an uninterrupted row of stitches, the lines of which running over the edges lie parallel and are connected with one another by rectangularly running rows of stitches. Now in order to carry this out in practice it is on the one hand necessary that the bends should always be made in the same direction, in order to enable the mechanism operating the cloth feeder to run in the same direction, whereby a simple and rapid and permanently certain arrangement is obtained. In this way a pattern is formed which is repeated at each operation, the initial line of which connects with the concluding line of the previous operation. I

The apparatus for carrying out this method consists substantially of a pattern wheel which is provided with teeth which produce the bending or deflection of the seam and also the guiding of the ordinary cloth feeder, and the turning of the ordinary hooked needle, and consequently are arranged at such distances apart that their intermediate spaces correspond to the number of stitches to be made in each row of stitches. By the loose mounting of this pat tern wheel, it is also possible to rotate it in such a way that the seams may be made at right angles to one another, without an alteration of the apparatus being necessary, and, as may be the case, when a hole is to be closed by a flap placed thereon.

The method according to this invention will now be more particularly described with reference to the accompanying drawings in connection with one form of construction of the apparatus, as an example.

Figure 1 is a front view partly in section, of the machine; Fig. 2 is a detail view of the improved apparatus; Fig. 3, a side View partly in section of the same; Fig. 4:, an enlarged viewof the shifting device; Fig. 5 explains the course of the seam; while Fig. 6 shows on an enlarged scale the repeating pattern.

In the improved sack mending machine, a cloth feeder is employed in the ordinary way, which acts in conjunction .with a hooked needle which together can work in any direction and may be suitably operated by means of a common driving mechanism (Fig. 1). Now in order to place a flap b,

for instance, on a defective place in the sack a, the flap is itself efiectively covered at the edge by a covering seam, after it has feeder and the hooked needle, it is preferable that it should always turn in the same direction, so that the shafts and the like serving for operating the said parts do not require to make forward and backward movements, but can always rotate in the same uniform direction. The pattern consists of longitudinal rows d, f, h and is, the two outer rows f and it having one row longer than the inner ones at and is, and connected with the same on one side by a cross row 9, and on the other end by cross stitches e and 2'. The stitches Z then connect with the next pattern. The various lines of stitches may of course be of any suitable length, but the pattern shown in Fig. 5 represents a particularly practical form. Now in order to enable the lines of stitches to be automatically deflected at the various points without turning the bag or sack a, a shifting device is provided which is controlled by a so-called pattern wheel 3, which is removable, and the form of which depends on the pattern to be made.

' Y The shifting device is operated by the driving shaft 1 of the machine and the pattern wheel 3 is operated by means of a worm and worm wheel 2, which pattern wheel is arranged on the shaft 4. The pattern wheel 3 is provided with teeth 5, 6, 7, 8, 9 and 10, which are intended to operate the deflection of the seams, that is to say, the displacement of the bag a in a direction displaced through 90. The distances between these teeth also correspond to the number of stitches which are to be made in the same direction. Thus, for instance, in the present construction, the distance between the teeth 10 and 5 allows eight stitches of the line cl to be made and then, in consequence of the enlargement of the tooth 5, a displacement twice in quick succession, in which the needle only makes a single stitch, which corresponds to the stitch e of the seam, whereupon the distance between the teeth 5 and 6 yields the nine stitches f and so-forth. Thus on a complete revolution of the pattern wheel 3 the pattern shown in Fig. 5 is made, whereupon it is repeated at the next revolution and connected with the line of stitches Z. The pattern wheel 3 acts in conjunction with a lever 12, pivoted at 13 and acted on by a spring 14. This lever 12 is provided with a projection 11 and successively encounters the various teeth 5 to 10 and thereby the lever 12 is turned. By this movement a slide piece 15, which is displaceably but not revolubly mounted on the shaft 1, is axially displaced, thereby bringing a cam 16 into an operative position, whereupon the shifting mechanism operates. This shifting device consists substantially of a piece 22 in the form of a Maltese cross on a shaft 24:, which is connected by bevel wheels 28 and a shaft 25 with the setting device of the cloth feeder and hooked needle in such a way that at each quarter revolution of the cross 22, a deflection of the seam through 90 is produced. In order to arrest the cross 22 in the desired position, it bears by means of its periphery, which is suitably cut out in a concave or semi-circular form, on a rotary disk 19, which is secured on the shaft 1. In this disk 19 a radially movable slide piece 20 is located, which carries a pin 18, which is adapted to enter a slot 23 of the cross 22 when it is in an operative position, and thus the pin 18 is intermittently brought into engagement with the cross 22 for moving the same.

The slide piece 20 is under the action of springs 21 and is provided with a slot 27, which allows free play to the slide piece in its movement. A roller 17 is also provided on the slide 20, which roller acts in conjunction with a cam 16 which is adapted to be thrown into and out of action. Now when one of the teeth 5-10 encounters the projection 11 of the lever 12 and thereby brings the cam 16 into the operative position, which cam does not turn, the roller 17 revolving with the disk 19 mounts the cam 10 and at a given moment the slide piece 20 is pushed outward, whereby its pin 18 enters the next slot 23 of the cross 22 and moves the latter forward a quarter of a revolution, so that the line of scam is turned through 90 and assumes a fresh direction. The cross piece 22 therefore always only makes one turn in the same direction, whereby the arms of the cross 22 enter a reeess 26 in the disk 20. An arrangement is also adopted to enable exactly the same arrangement, without any alteration, to be employed for enabling the entire seam pattern (Fig. 5) displaced through 90 to be continued, as shown in Fig. 4. For this object the pattern wheel 3 is mounted on the shaft 4c, so as to be loosely revoluble. For coupling the same with the worm wheel 2, a pin 33 is provided, which is guided in a casing 29 of the pattern wheel 3, and the end 31 of which is pressed into a suitable recess 32 by means of a spring 30. These recesses 32 are each arranged at 90 to each other (as shown in Fig. 2 in dotted lines). Now if the seam m shown in full lines (Fig. 5) is to be connected with the seam shown in dotted lines, the coupling is released by drawing out the pin 33 and the pattern wheel 3 is rotated through 90 in the direction indicated by the arrow. The first part of the seam ceases at the single stitch z', and then eight stiches are further added, whereupon the teeth 6 and 7 are displaced again, that is to say produce a cross line of stitching 9 of three stitches and so-forth. In other words the same seam is made displaced through 90 and Without interruption of the line of seam.

Now in order to be able to work without the use of the shifting device, that is to say with an always uniform direction of movement, for instance in making the seam c,

the cross 22 is arranged so as to be loosely revoluble on the shaft 24 and may be coupled with the latter by an axially movable clutch 36, the latter then engaging in suitable clutches 37 of the wheel 32. This displacement is effected by a hand lever 84, which turns on a pin 85, and is stopped in the two end positions by a pin 38 which is under the action of a spring 39, and when displaced slips over a ridge 40 of the hand lever 34:, so that the lever remains stationary in each end position.

We declare that what we claim is 1. A sewing machine for repairing sacks having a cloth feeder and hook needle which are rotated for changing the direction of feed, and means for rotating the feeder and needle including a controlling shaft, a driving shaft, intermittently effective means for operating said controlling shaft from the driving-shaft, and a pattern wheel for rendering said intermittently effective means operative.

2. A sewing machine for repairing sacks having a cloth feeder and hook needle which are rotated for changing the direction of feed, means for rotating the feeder and needle including a controlling shaft, a driving shaft, intermittently effective means for operating said controlling shaft from the driving shaft, and a pattern wheel for rendering said intermittently effective means operative, said operating means between the driving shaft and controlling shaft being so constructed as to shift the cloth feeder when set in action so as to form lines of stitching extending at right angles to each other.

3. A sewing machine for repairing sacks Copies of this patent may be obtained for having a cloth feeder and hook needle which are rotated for changing the direction of feed, and means for rotating the feed and needle, including a controlling shaft connected to the cloth feeder, a driving shaft, a disk fixed on the driving shaft, a controlling member having radial slots fixed on the controlling shaft and normally held from movement by said disk, means carried by the disks for engaging the controlling member for rotating the controlling shaft, and a pattern mechanism operated by the driving shaft for connecting the disk to the controlling member.

4:. A sewing machine for repairing sacks having a cloth feeder and hook needle which are rotated for changing the direction of feed, and means for rotating the feed and needle, including a controlling shaft connected to the cloth feeder, a driving shaft, a disk fixed on the driving shaft, a controlling member having radial slots fixed on the controlling shaft and normally held from movement by said disk, means carried by the disk for engaging the controlling member for rotating the controlling shaft, and a pattern mechanism operated by the driving shaft for connecting the disk to the controlling member, said radial slots in the controlling member being arranged at right angles to one another, whereby each movement given to the controlling shaft imparts a quarter turn thereto and positions the lines of stitching at right angles to each other.

5. A sewing machine for repairing sacks having a cloth feeder and hook needle which are rotated for changing the direction of feed, means for rotating the feeder and needle including a controlling shaft, a driving shaft, intermittently efliective means for operating said controlling shaft from the driving shaft, and a pattern wheel for rendering said intermittently effective means operative, said pattern wheel being loosely mounted on its supporting shaft and adapted to be coupled thereto by hand.

In testimony whereof we affix our signatures, in presence of two witnesses.

FRITZ VVEVER. KARL MAIER. Witnesses:

RUDOLF Bnnorrr, KARL JASPER.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

